Datasheet AD746 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual Precision, 500 ns Settling, BiFET Op Amp |
| Pages / Page | 8 / 7 — AD746. A HIGH SPEED 3 OR AMP INSTRUMENTATION. Table I. Performance … |
| Revision | B |
| File Format / Size | PDF / 439 Kb |
| Document Language | English |
AD746. A HIGH SPEED 3 OR AMP INSTRUMENTATION. Table I. Performance Summary for the 3 Op Amp. AMPLIFIER CIRCUIT
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AD746 A HIGH SPEED 3 OR AMP INSTRUMENTATION Table I. Performance Summary for the 3 Op Amp AMPLIFIER CIRCUIT Instrumentation Amplifier Circuit
The instrumentation amplifier circuit shown in Figure 23 can
T
provide a range of gains from 2 up to 1000 and higher. The
SETTLE Gain R
circuit bandwidth is 2.5 MHz at a gain of 2 and 750 kHz at a
G Bandwidth (0.01%)
gain of 10; settling time for the entire circuit is less than 2 µs to 2 20 kΩ 2.5 MHz 1.0 µs within 0.01% for a 10 volt step, (G = 10). 10 4.04 kΩ 1 MHz 2.0 µs 100 404 Ω 290 kHz 5.0 µs Figure 25. Settling Time of the 3 Op Amp Instrumentation Amplifier. Gain = 10, Horizontal Scale: 0.5 µs/Div, Vertical Scale: 5 V/Div. Error Signal Scale: 0.01%/Div.
THD Performance Considerations
The AD746 was carefully optimized to offer excellent performance in terms of total harmonic distortion (THD) in signal processing applications. The THD level when operating the AD746 in inverting gain applications will show a gradual rise from the distortion floor of 20 dB/decade (see Figure 28). In noninverting applications, care should be taken to balance the source impedances at both the inverting and noninverting inputs, to avoid distortion caused by the modulation of input Figure 23. A High Performance, 3 Op Amp, Instrumenta- capacitance inherent in all BiFET op amps. tion Amplifier Circuit Figure 26. THD Measurement, Inverter Circuit Figure 24. Pulse Response of the 3 Op Amp Instrumentation Amplifier. Gain = 10, Horizontal Scale: 0.5 µs/Div, Vertical Scale: 5 V/Div. Figure 27. THD Measurement, Follower Circuit REV. B –7–
The instrumentation amplifier circuit shown in Figure 23 can
T
provide a range of gains from 2 up to 1000 and higher. The
SETTLE Gain R
circuit bandwidth is 2.5 MHz at a gain of 2 and 750 kHz at a
G Bandwidth (0.01%)
gain of 10; settling time for the entire circuit is less than 2 µs to 2 20 kΩ 2.5 MHz 1.0 µs within 0.01% for a 10 volt step, (G = 10). 10 4.04 kΩ 1 MHz 2.0 µs 100 404 Ω 290 kHz 5.0 µs Figure 25. Settling Time of the 3 Op Amp Instrumentation Amplifier. Gain = 10, Horizontal Scale: 0.5 µs/Div, Vertical Scale: 5 V/Div. Error Signal Scale: 0.01%/Div.
THD Performance Considerations
The AD746 was carefully optimized to offer excellent performance in terms of total harmonic distortion (THD) in signal processing applications. The THD level when operating the AD746 in inverting gain applications will show a gradual rise from the distortion floor of 20 dB/decade (see Figure 28). In noninverting applications, care should be taken to balance the source impedances at both the inverting and noninverting inputs, to avoid distortion caused by the modulation of input Figure 23. A High Performance, 3 Op Amp, Instrumenta- capacitance inherent in all BiFET op amps. tion Amplifier Circuit Figure 26. THD Measurement, Inverter Circuit Figure 24. Pulse Response of the 3 Op Amp Instrumentation Amplifier. Gain = 10, Horizontal Scale: 0.5 µs/Div, Vertical Scale: 5 V/Div. Figure 27. THD Measurement, Follower Circuit REV. B –7–
